linux-kernel - Re: [RFC/PATCH 0/4] CPUSET driven CPU isolation

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Message-ID: <47C7122E.1000404@qualcomm.com>
Date:	Thu, 28 Feb 2008 11:57:34 -0800
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	Mark Hounschell <dmarkh@....rr.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...sign.ru>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Jackson <pj@....com>, linux-kernel@...r.kernel.org,
	"markh@...pro.net >> Mark Hounschell" <markh@...pro.net>
Subject: Re: [RFC/PATCH 0/4] CPUSET driven CPU isolation

Mark Hounschell wrote:
> Peter Zijlstra wrote:
>> My vision on the direction we should take wrt cpu isolation.
>>
>> Next on the list would be figuring out a nice solution to the workqueue
>> flush issue.
>>
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> 
> Is it now the intent, not only that I have to enable cpusets in the
> kernel but I will also have to use them in userland to take advantage of
> this.
> 
> And hot-plug too??
> 
> Can I predict that in the future that userland sched_setaffinity will be
> taken away also and be forced to use cpusets?
> 
> And hot-plug too??

Mark,
I bet you won't get any replies (besides mine). And yes this means that you
will have to enable cpusets if Peter's patches go in (looks like they will).
Hot-plug may not be needed unless I convince people to reuse the hot-plug
instead of introducing new notifiers.
I guess we can make some extensions to expose "system" bit just like I did
with "isolated" bit via sysfs. In which case cpusets may not be needed. We'll see.

Max


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